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libthread: add threadmaybackground Programs that want to background themselves now need to define threadmaybackground returning 1. This avoids a confusing (to people and debuggers) extra parent process for all the threaded programs that will never want to background themselves.
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  1 6f4d00ee 2013-09-23 0intro #include "stdinc.h"

  2 6f4d00ee 2013-09-23 0intro #include <ctype.h>

  3 6f4d00ee 2013-09-23 0intro 

  4 6f4d00ee 2013-09-23 0intro #include "9.h"

  5 6f4d00ee 2013-09-23 0intro 

  6 6f4d00ee 2013-09-23 0intro int Dflag;

  7 6f4d00ee 2013-09-23 0intro int mempcnt;			/* for 9fsys.c */

  8 6f4d00ee 2013-09-23 0intro char* none = "none";

  9 6f4d00ee 2013-09-23 0intro char* foptname = "/none/such";

 10 6f4d00ee 2013-09-23 0intro 

 11 6f4d00ee 2013-09-23 0intro static void

 12 6f4d00ee 2013-09-23 0intro usage(void)

 13 6f4d00ee 2013-09-23 0intro {

 14 6f4d00ee 2013-09-23 0intro 	fprint(2, "usage: %s [-Dt] [-c cmd] [-f partition] [-m %%]\n", argv0);

 15 4b576658 2013-09-23 0intro 	threadexitsall("usage");

 16 6f4d00ee 2013-09-23 0intro }

 17 6f4d00ee 2013-09-23 0intro 

 18 6f4d00ee 2013-09-23 0intro static void

 19 6f4d00ee 2013-09-23 0intro readCmdPart(char *file, char ***pcmd, int *pncmd)

 20 6f4d00ee 2013-09-23 0intro {

 21 6f4d00ee 2013-09-23 0intro 	char buf[1024+1], *f[1024];

 22 6f4d00ee 2013-09-23 0intro 	char tbuf[1024];

 23 6f4d00ee 2013-09-23 0intro 	int nf;

 24 6f4d00ee 2013-09-23 0intro 	int i, fd, n;

 25 6f4d00ee 2013-09-23 0intro 	char **cmd, *p;

 26 6f4d00ee 2013-09-23 0intro 	int ncmd;

 27 6f4d00ee 2013-09-23 0intro 

 28 6f4d00ee 2013-09-23 0intro 	cmd = *pcmd;

 29 6f4d00ee 2013-09-23 0intro 	ncmd = *pncmd;

 30 6f4d00ee 2013-09-23 0intro 

 31 6f4d00ee 2013-09-23 0intro 	if((fd = open(file, OREAD)) < 0)

 32 6f4d00ee 2013-09-23 0intro 		sysfatal("open %s: %r", file);

 33 6f4d00ee 2013-09-23 0intro 	if(seek(fd, 127*1024, 0) != 127*1024)

 34 6f4d00ee 2013-09-23 0intro 		sysfatal("seek %s 127kB: %r", file);

 35 6f4d00ee 2013-09-23 0intro 	n = readn(fd, buf, sizeof buf-1);

 36 6f4d00ee 2013-09-23 0intro 	if(n == 0)

 37 6f4d00ee 2013-09-23 0intro 		sysfatal("short read of %s at 127kB", file);

 38 6f4d00ee 2013-09-23 0intro 	if(n < 0)

 39 6f4d00ee 2013-09-23 0intro 		sysfatal("read %s: %r", file);

 40 6f4d00ee 2013-09-23 0intro 	buf[n] = 0;

 41 6f4d00ee 2013-09-23 0intro 	if(memcmp(buf, "fossil config\n", 6+1+6+1) != 0)

 42 6f4d00ee 2013-09-23 0intro 		sysfatal("bad config magic in %s", file);

 43 6f4d00ee 2013-09-23 0intro 	nf = getfields(buf+6+1+6+1, f, nelem(f), 1, "\n");

 44 6f4d00ee 2013-09-23 0intro 	for(i=0; i<nf; i++){

 45 6f4d00ee 2013-09-23 0intro 		if(f[i][0] == '#')

 46 6f4d00ee 2013-09-23 0intro 			continue;

 47 4b576658 2013-09-23 0intro 		cmd = vtrealloc(cmd, (ncmd+1)*sizeof(char*));

 48 6f4d00ee 2013-09-23 0intro 		/* expand argument '*' to mean current file */

 49 6f4d00ee 2013-09-23 0intro 		if((p = strchr(f[i], '*')) && (p==f[i]||isspace(p[-1])) && (p[1]==0||isspace(p[1]))){

 50 6f4d00ee 2013-09-23 0intro 			memmove(tbuf, f[i], p-f[i]);

 51 6f4d00ee 2013-09-23 0intro 			strecpy(tbuf+(p-f[i]), tbuf+sizeof tbuf, file);

 52 6f4d00ee 2013-09-23 0intro 			strecpy(tbuf+strlen(tbuf), tbuf+sizeof tbuf, p+1);

 53 6f4d00ee 2013-09-23 0intro 			f[i] = tbuf;

 54 6f4d00ee 2013-09-23 0intro 		}

 55 4b576658 2013-09-23 0intro 		cmd[ncmd++] = vtstrdup(f[i]);

 56 6f4d00ee 2013-09-23 0intro 	}

 57 6f4d00ee 2013-09-23 0intro 	close(fd);

 58 6f4d00ee 2013-09-23 0intro 	*pcmd = cmd;

 59 6f4d00ee 2013-09-23 0intro 	*pncmd = ncmd;

 60 6f4d00ee 2013-09-23 0intro }

 61 6f4d00ee 2013-09-23 0intro 

 62 b3a20a96 2020-12-30 rsc int

 63 b3a20a96 2020-12-30 rsc threadmaybackground(void)

 64 b3a20a96 2020-12-30 rsc {

 65 b3a20a96 2020-12-30 rsc 	return 1;

 66 b3a20a96 2020-12-30 rsc }

 67 b3a20a96 2020-12-30 rsc 

 68 6f4d00ee 2013-09-23 0intro void

 69 4b576658 2013-09-23 0intro threadmain(int argc, char* argv[])

 70 6f4d00ee 2013-09-23 0intro {

 71 6f4d00ee 2013-09-23 0intro 	char **cmd, *p;

 72 6f4d00ee 2013-09-23 0intro 	int i, ncmd, tflag;

 73 6f4d00ee 2013-09-23 0intro 

 74 6f4d00ee 2013-09-23 0intro 	fmtinstall('D', dirfmt);

 75 6f4d00ee 2013-09-23 0intro 	fmtinstall('F', fcallfmt);

 76 6f4d00ee 2013-09-23 0intro 	fmtinstall('M', dirmodefmt);

 77 6f4d00ee 2013-09-23 0intro 	quotefmtinstall();

 78 6f4d00ee 2013-09-23 0intro 

 79 6f4d00ee 2013-09-23 0intro 	/*

 80 6f4d00ee 2013-09-23 0intro 	 * Insulate from the invoker's environment.

 81 6f4d00ee 2013-09-23 0intro 	 */

 82 b32de4ae 2013-09-26 0intro #ifdef PLAN9PORT

 83 b32de4ae 2013-09-26 0intro 	if(rfork(RFNAMEG) < 0)

 84 b32de4ae 2013-09-26 0intro #else

 85 6f4d00ee 2013-09-23 0intro 	if(rfork(RFREND|RFNOTEG|RFNAMEG) < 0)

 86 b32de4ae 2013-09-26 0intro #endif

 87 6f4d00ee 2013-09-23 0intro 		sysfatal("rfork: %r");

 88 6f4d00ee 2013-09-23 0intro 

 89 6f4d00ee 2013-09-23 0intro 	close(0);

 90 6f4d00ee 2013-09-23 0intro 	open("/dev/null", OREAD);

 91 6f4d00ee 2013-09-23 0intro 	close(1);

 92 6f4d00ee 2013-09-23 0intro 	open("/dev/null", OWRITE);

 93 6f4d00ee 2013-09-23 0intro 

 94 6f4d00ee 2013-09-23 0intro 	cmd = nil;

 95 6f4d00ee 2013-09-23 0intro 	ncmd = tflag = 0;

 96 6f4d00ee 2013-09-23 0intro 

 97 6f4d00ee 2013-09-23 0intro 	ARGBEGIN{

 98 6f4d00ee 2013-09-23 0intro 	case '?':

 99 6f4d00ee 2013-09-23 0intro 	default:

100 6f4d00ee 2013-09-23 0intro 		usage();

101 6f4d00ee 2013-09-23 0intro 		break;

102 6f4d00ee 2013-09-23 0intro 	case 'c':

103 6f4d00ee 2013-09-23 0intro 		p = EARGF(usage());

104 6f4d00ee 2013-09-23 0intro 		currfsysname = p;

105 4b576658 2013-09-23 0intro 		cmd = vtrealloc(cmd, (ncmd+1)*sizeof(char*));

106 6f4d00ee 2013-09-23 0intro 		cmd[ncmd++] = p;

107 6f4d00ee 2013-09-23 0intro 		break;

108 6f4d00ee 2013-09-23 0intro 	case 'D':

109 6f4d00ee 2013-09-23 0intro 		Dflag ^= 1;

110 6f4d00ee 2013-09-23 0intro 		break;

111 6f4d00ee 2013-09-23 0intro 	case 'f':

112 6f4d00ee 2013-09-23 0intro 		p = EARGF(usage());

113 6f4d00ee 2013-09-23 0intro 		currfsysname = foptname = p;

114 6f4d00ee 2013-09-23 0intro 		readCmdPart(p, &cmd, &ncmd);

115 6f4d00ee 2013-09-23 0intro 		break;

116 6f4d00ee 2013-09-23 0intro 	case 'm':

117 6f4d00ee 2013-09-23 0intro 		mempcnt = atoi(EARGF(usage()));

118 6f4d00ee 2013-09-23 0intro 		if(mempcnt <= 0 || mempcnt >= 100)

119 6f4d00ee 2013-09-23 0intro 			usage();

120 6f4d00ee 2013-09-23 0intro 		break;

121 6f4d00ee 2013-09-23 0intro 	case 't':

122 6f4d00ee 2013-09-23 0intro 		tflag = 1;

123 6f4d00ee 2013-09-23 0intro 		break;

124 6f4d00ee 2013-09-23 0intro 	}ARGEND

125 6f4d00ee 2013-09-23 0intro 	if(argc != 0)

126 6f4d00ee 2013-09-23 0intro 		usage();

127 6f4d00ee 2013-09-23 0intro 

128 6f4d00ee 2013-09-23 0intro 	consInit();

129 6f4d00ee 2013-09-23 0intro 	cliInit();

130 6f4d00ee 2013-09-23 0intro 	msgInit();

131 6f4d00ee 2013-09-23 0intro 	conInit();

132 6f4d00ee 2013-09-23 0intro 	cmdInit();

133 6f4d00ee 2013-09-23 0intro 	fsysInit();

134 6f4d00ee 2013-09-23 0intro 	exclInit();

135 6f4d00ee 2013-09-23 0intro 	fidInit();

136 6f4d00ee 2013-09-23 0intro 

137 6f4d00ee 2013-09-23 0intro 	srvInit();

138 6f4d00ee 2013-09-23 0intro 	lstnInit();

139 6f4d00ee 2013-09-23 0intro 	usersInit();

140 6f4d00ee 2013-09-23 0intro 

141 6f4d00ee 2013-09-23 0intro 	for(i = 0; i < ncmd; i++)

142 6f4d00ee 2013-09-23 0intro 		if(cliExec(cmd[i]) == 0)

143 4b576658 2013-09-23 0intro 			fprint(2, "%s: %r\n", cmd[i]);

144 4b576658 2013-09-23 0intro 	vtfree(cmd);

145 6f4d00ee 2013-09-23 0intro 

146 6f4d00ee 2013-09-23 0intro 	if(tflag && consTTY() == 0)

147 4b576658 2013-09-23 0intro 		consPrint("%r\n");

148 6f4d00ee 2013-09-23 0intro 

149 4b576658 2013-09-23 0intro 	threadexits(0);

150 6f4d00ee 2013-09-23 0intro }