diff options
Diffstat (limited to 'man3/popen.3')
| -rw-r--r-- | man3/popen.3 | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/man3/popen.3 b/man3/popen.3 index 698fe28..6c2cd00 100644 --- a/man3/popen.3 +++ b/man3/popen.3 @@ -10,7 +10,7 @@ .\" Modified Sat May 18 20:37:44 1996 by Martin Schulze (joey@linux.de) .\" Modified 7 May 1998 by Joseph S. Myers (jsm28@cam.ac.uk) .\" -.TH popen 3 2023-07-20 "Linux man-pages 6.05.01" +.TH popen 3 2023-10-31 "Linux man-pages 6.7" .SH NAME popen, pclose \- pipe stream to or from a process .SH LIBRARY @@ -19,16 +19,16 @@ Standard C library .SH SYNOPSIS .nf .B #include <stdio.h> -.PP +.P .BI "FILE *popen(const char *" command ", const char *" type ); .BI "int pclose(FILE *" stream ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR popen (), .BR pclose (): .nf @@ -44,7 +44,7 @@ Since a pipe is by definition unidirectional, the .I type argument may specify only reading or writing, not both; the resulting stream is correspondingly read-only or write-only. -.PP +.P The .I command argument is a pointer to a null-terminated string containing a shell @@ -54,7 +54,7 @@ This command is passed to using the .B \-c flag; interpretation, if any, is performed by the shell. -.PP +.P The .I type argument is a pointer to a null-terminated string which must contain @@ -69,7 +69,7 @@ see the description of the flag in .BR open (2) for reasons why this may be useful. -.PP +.P The return value from .BR popen () is a normal standard I/O stream in all respects save that it must be closed @@ -85,11 +85,11 @@ Conversely, reading from the stream reads the command's standard output, and the command's standard input is the same as that of the process that called .BR popen (). -.PP +.P Note that output .BR popen () streams are block buffered by default. -.PP +.P The .BR pclose () function waits for the associated process to terminate and returns the exit @@ -105,7 +105,7 @@ or .BR pipe (2) calls fail, or if the function cannot allocate memory, NULL is returned. -.PP +.P .BR pclose (): on success, returns the exit status of the command; if .\" These conditions actually give undefined results, so I commented @@ -117,7 +117,7 @@ on success, returns the exit status of the command; if .BR wait4 (2) returns an error, or some other error is detected, \-1 is returned. -.PP +.P On failure, both functions set .I errno to indicate the error. @@ -140,7 +140,7 @@ argument is invalid, and this condition is detected, .I errno is set to .BR EINVAL . -.PP +.P If .BR pclose () cannot obtain the child status, @@ -162,7 +162,6 @@ T{ .BR pclose () T} Thread safety MT-Safe .TE -.sp 1 .SH VERSIONS The \[aq]e\[aq] value for .I type @@ -187,9 +186,9 @@ The latter can be avoided by calling .BR fflush (3) before .BR popen (). -.PP +.P Failure to execute the shell is indistinguishable from the shell's failure -to execute command, or an immediate exit of the command. +to execute the command, or an immediate exit of the command. The only hint is an exit status of 127. .\" .SH HISTORY .\" A |